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Forum: CFX

March 26, 2012, 09:34

Replies: 19

Need help in FSI CFX+WORKBENCH

Views: 2,911

Posted By stumpy

No, that's not sufficient. 4 stagger loops with...

No, that's not sufficient. 4 stagger loops with an under-relaxation factor of 0.2 isn't enough for convergence. Try working through the math.... with a load change from 0 to 1, with an...

Forum: CFX

March 21, 2012, 09:55

Replies: 19

Need help in FSI CFX+WORKBENCH

Views: 2,911

Posted By stumpy

Negative pressures on flexible tubes are not good...

Negative pressures on flexible tubes are not good - they will cause the tube to collapse. In the real world do you expect negative pressures? If you are using zero pressure boundary conditions then...

Forum: CFX

March 20, 2012, 09:13

Replies: 19

Need help in FSI CFX+WORKBENCH

Views: 2,911

Posted By stumpy

It looks like the tube is in tension. If you run...

It looks like the tube is in tension. If you run a Mechanical simulation (no FSI) and apply a constant Pressure do you get uniform raidal deformation? If so, then look at the Pressure field in CFX...

Forum: CFX

March 13, 2012, 13:35

Replies: 19

Need help in FSI CFX+WORKBENCH

Views: 2,911

Posted By stumpy

In general if the elastic tube is in tension...

In general if the elastic tube is in tension (positive force are passed) then I would expect radial deformations to uniform (or close to uniform). If you are passing negative forces, then that would...

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